Two specimens: a) One growing on the other side of the lake 11/18/15
b) One growing on trail in Mt. Park 11/27/15

Cap is white with scales
Gills are free
spore print is brown
Growing in suburban landscaped area

"Agaricus section Xanthodermatei comprises a group of species allied to
A. xanthodermus and generally characterized by basidiomata having phenolic odors,
transiently yellowing discolorations in some parts of the basidiome,
Schaeffer’s reaction negative, and mild to substantial toxicity."
(from http://www.mycologia.org/content/97/6/1292.full)